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Kun-Fang Cao. (2001). Morphology and growth of deciduous and evergreen broad-leaved saplings under different light conditions in a Chinese beech forest with dense bamboo undergrowth. , 16(3), 509–517. doi:10.1046/j.1440-1703.2001.00413.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research